Streaming video stops when initiate closed captioning

So our company has a streaming video feed coming from the folks over at quickplay.com.

All was good watching the streaming video in Safari (iOS 8 and Mac 10.10)...UNTIL you turn on closed captioning. Now anytime you load the feed you get a "Missing plug-in" message with "This page contains content of “application/vnd.apple.mpegurl” type. You do not have the plug-in required to view this content."

Close/restart Safari, or rebooting does nothing...happens on the Mac and iPhone. So I came across the enable Accessibility options for closed captioning on both devices in Settings and nothing.

One of our staff needs to view this feed with the CC on to monitor it. So I guess first where on both devices is it caching the preference to use CC and making them unable to stream the feed any longer. And then...why is this not working?